From 287c84a0b45cc826b1200f4cf4be3547d2fcd69c Mon Sep 17 00:00:00 2001
From: Tim Northover <tnorthover@apple.com>
Date: Fri, 23 Aug 2013 10:16:39 +0000
Subject: [PATCH] ARM: make sure ARM-mode pseudo-inst requires IsARM

I'd forgotten that "Requires" blocks override rather than add to the
constraints, so my pseudo-instruction was being selected in Thumb mode leading
to nonsense instructions.

rdar://problem/14817358

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189096 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMInstrInfo.td       |  2 +-
 test/CodeGen/Thumb2/thumb2-select.ll | 11 ++++++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/lib/Target/ARM/ARMInstrInfo.td b/lib/Target/ARM/ARMInstrInfo.td
index a4ea69f7a8b..df64a09514a 100644
--- a/lib/Target/ARM/ARMInstrInfo.td
+++ b/lib/Target/ARM/ARMInstrInfo.td
@@ -4197,7 +4197,7 @@ def MOVCCi32imm
                     8, IIC_iCMOVix2,
                     [(set GPR:$Rd, (ARMcmov GPR:$false, imm:$src,
                                             cmovpred:$p))]>,
-      RegConstraint<"$false = $Rd">, Requires<[HasV6T2]>;
+      RegConstraint<"$false = $Rd">, Requires<[IsARM, HasV6T2]>;
 
 let isMoveImm = 1 in
 def MVNCCi : ARMPseudoInst<(outs GPR:$Rd),
diff --git a/test/CodeGen/Thumb2/thumb2-select.ll b/test/CodeGen/Thumb2/thumb2-select.ll
index c4d4480965e..5f5fa199251 100644
--- a/test/CodeGen/Thumb2/thumb2-select.ll
+++ b/test/CodeGen/Thumb2/thumb2-select.ll
@@ -99,8 +99,17 @@ entry:
 
 define i32 @f10(i32 %a, i32 %b) {
 ; CHECK-LABEL: f10:
-; CHECK: movwne r2, #1234    @ encoding: [0x40,0xf2,0xd2,0x42]
+; CHECK: movwne {{r[0-9]+}}, #1234    @ encoding: [0x40,0xf2,0xd2,0x4{{[0-9a-f]+}}]
     %tst = icmp ne i32 %a, %b
     %val = select i1 %tst, i32 1234, i32 12345
     ret i32 %val
 }
+
+; Make sure we pick the Thumb encoding for movw/movt
+define i32 @f11(i32 %a, i32 %b) {
+; CHECK-LABEL: f11:
+; CHECK: movwne {{r[0-9]+}}, #50033         @ encoding: [0x4c,0xf2,0x71,0x3{{[0-9a-f]+}}]
+    %tst = icmp ne i32 %a, %b
+    %val = select i1 %tst, i32 123454321, i32 543212345
+    ret i32 %val
+}